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Check Eng Light Wiring

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Old 05-28-2010, 11:44 PM
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Default Check Eng Light Wiring
Does the check engine light PCM wire put out 12v (+) or is it a ground (-) to turn the light on when needed? I got ready to wire it in and I didn't have any info on it. It's an 04 GTO harness and PCM.
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Old 05-28-2010, 11:48 PM
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subscribed, I also need to know this. I have a positive/negative test light, if no one has posted by then I'll let you know.
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Old 05-29-2010, 12:05 AM
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PCM puts out a ground signal
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Old 05-29-2010, 12:16 AM
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most of the outputs from the ecm are ground. from what ive studied
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Old 05-29-2010, 08:18 PM
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I check mine today, it is a ground (-).
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